Local Contrast

This script uses specific parameters of the "Unsharp Mask" filter to increase the local contrast.

As result you get two layers allowing you to handle "lightening" and "darkening" aspects of the image contrast individually.

For example, if you find the overall image too bright, reduce the opacity of the "Local Contrast (Lighten)" layer.

Or, if you noticed too dark spots, click on the "Local Contrast (Darken)" layer and clear the corresponding areas with the Eraser tool.